spec: increase IMPLICIT_WAIT_TIMEOUT a bit :'(
spec: increase IMPLICIT_WAIT_TIMEOUT a bit :'(

with removal of lots of keep_trying_until, many wait timeouts dropped from
20 sec to 10 sec. a handful of specs have started failing because of this,
due to long running actions (e.g. course migrations)

Change-Id: I956c86faa8605f690de584367a03c549bc20407c
Reviewed-on: https://gerrit.instructure.com/80565
Tested-by: Jenkins
Reviewed-by: Landon Wilkins <e219b0c23c4256074cdfc7a23138e4f17200b08f@instructure.com>
Product-Review: Landon Wilkins <e219b0c23c4256074cdfc7a23138e4f17200b08f@instructure.com>
QA-Review: Landon Wilkins <e219b0c23c4256074cdfc7a23138e4f17200b08f@instructure.com>

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